Methods and apparatus for investigating an earth formation and compensating for borehole environmental effects
Patent
·
OSTI ID:6416106
In the illustrative embodiment of the invention disclosed, a neutron porosity logging tool adapted to log a mud-filled borehole includes one or more pairs of epi-thermal and/or thermal neutron detectors. The detector count rates are corrected to the effective count rates for fresh water in the borehole by applying thereto empirically-derived correction terms that are functionally related to the hydrogen index of the mud and, in the case of thermal detectors, also to the thermal neutron absorption properties in the mud.
- Assignee:
- Schlumberger Technology Corporation
- Patent Number(s):
- US 4524274
- OSTI ID:
- 6416106
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
02 PETROLEUM
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
COUNTING RATES
DETECTION
ELEMENTS
EQUIPMENT
FLUIDS
FRESH WATER
HYDROGEN
HYDROGEN COMPOUNDS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
NEUTRON LOGGING
NONMETALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION DETECTION
RADIATION DETECTORS
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
THERMODYNAMIC PROPERTIES
WATER
WELL LOGGING
WELL LOGGING EQUIPMENT
020200* -- Petroleum-- Reserves
Geology
& Exploration
03 NATURAL GAS
030200 -- Natural Gas-- Reserves
Geology
& Exploration
COUNTING RATES
DETECTION
ELEMENTS
EQUIPMENT
FLUIDS
FRESH WATER
HYDROGEN
HYDROGEN COMPOUNDS
MEASURING INSTRUMENTS
NEUTRON DETECTION
NEUTRON DETECTORS
NEUTRON LOGGING
NONMETALS
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RADIATION DETECTION
RADIATION DETECTORS
RADIOACTIVITY LOGGING
RESERVOIR FLUIDS
THERMODYNAMIC PROPERTIES
WATER
WELL LOGGING
WELL LOGGING EQUIPMENT